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regex for this ??

Hello forums!!
I would like to know the regex for the following:
input text can contain

alphanumeric characters along with underscore and space

for example: "this is user_name"
i used the following:

PHP Code:

/^[a-zA-Z0-9 _]+$/

this works but not perfectly because when the only space bar is pressed it takes the value, i want to prevent this, space should be @ the beginning, what will be the regex for this ?
Thanks in advance to all of you